[2403] | 1 | *
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| 2 | * $Id: mnhes1.F,v 1.1.1.1 2003-06-11 14:18:28 cmv Exp $
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| 3 | *
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| 4 | * $Log: not supported by cvs2svn $
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| 5 | * Revision 1.1.1.1 1996/03/07 14:31:30 mclareni
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| 6 | * Minuit
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| 7 | *
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| 8 | *
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| 9 | #include "minuit/pilot.h"
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| 10 | SUBROUTINE MNHES1(FCN,FUTIL)
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| 11 | #include "minuit/d506dp.inc"
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| 12 | CC Called from MNHESS and MNGRAD
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| 13 | CC Calculate first derivatives (GRD) and uncertainties (DGRD)
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| 14 | CC and appropriate step sizes GSTEP
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| 15 | #include "minuit/d506cm.inc"
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| 16 | EXTERNAL FCN,FUTIL
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| 17 | LOGICAL LDEBUG
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| 18 | CHARACTER CBF1*22
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| 19 | LDEBUG = (IDBG(5) .GE. 1)
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| 20 | IF (ISTRAT .LE. 0) NCYC = 1
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| 21 | IF (ISTRAT .EQ. 1) NCYC = 2
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| 22 | IF (ISTRAT .GT. 1) NCYC = 6
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| 23 | IDRV = 1
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| 24 | NPARX = NPAR
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| 25 | DFMIN = 4.*EPSMA2*(ABS(AMIN)+UP)
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| 26 | C main loop over parameters
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| 27 | DO 100 I= 1, NPAR
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| 28 | XTF = X(I)
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| 29 | DMIN = 4.*EPSMA2*ABS(XTF)
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| 30 | EPSPRI = EPSMA2 + ABS(GRD(I)*EPSMA2)
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| 31 | OPTSTP = SQRT(DFMIN/(ABS(G2(I))+EPSPRI))
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| 32 | D = 0.2 * ABS(GSTEP(I))
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| 33 | IF (D .GT. OPTSTP) D = OPTSTP
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| 34 | IF (D .LT. DMIN) D = DMIN
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| 35 | CHGOLD = 10000.
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| 36 | C iterate reducing step size
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| 37 | DO 50 ICYC= 1, NCYC
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| 38 | X(I) = XTF + D
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| 39 | CALL MNINEX(X)
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| 40 | CALL FCN(NPARX,GIN,FS1,U,4,FUTIL)
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| 41 | NFCN = NFCN + 1
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| 42 | X(I) = XTF - D
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| 43 | CALL MNINEX(X)
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| 44 | CALL FCN(NPARX,GIN,FS2,U,4,FUTIL)
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| 45 | NFCN = NFCN + 1
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| 46 | X(I) = XTF
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| 47 | C check if step sizes appropriate
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| 48 | SAG = 0.5*(FS1+FS2-2.0*AMIN)
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| 49 | GRDOLD = GRD(I)
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| 50 | GRDNEW = (FS1-FS2)/(2.0*D)
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| 51 | DGMIN = EPSMAC*(ABS(FS1)+ABS(FS2))/D
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| 52 | IF (LDEBUG) WRITE (ISYSWR,11) I,IDRV,GSTEP(I),D,G2(I),GRDNEW,SAG
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| 53 | 11 FORMAT (I4,I2,6G12.5)
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| 54 | IF (GRDNEW .EQ. ZERO) GO TO 60
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| 55 | CHANGE = ABS((GRDOLD-GRDNEW)/GRDNEW)
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| 56 | IF (CHANGE.GT.CHGOLD .AND. ICYC.GT.1) GO TO 60
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| 57 | CHGOLD = CHANGE
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| 58 | GRD(I) = GRDNEW
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| 59 | GSTEP(I) = SIGN(D,GSTEP(I))
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| 60 | C decrease step until first derivative changes by <5%
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| 61 | IF (CHANGE .LT. 0.05) GO TO 60
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| 62 | IF (ABS(GRDOLD-GRDNEW) .LT. DGMIN) GO TO 60
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| 63 | IF (D .LT. DMIN) THEN
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| 64 | CALL MNWARN('D','MNHES1','Step size too small for 1st drv.')
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| 65 | GO TO 60
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| 66 | ENDIF
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| 67 | D = 0.2*D
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| 68 | 50 CONTINUE
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| 69 | C loop satisfied = too many iter
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| 70 | WRITE (CBF1,'(2G11.3)') GRDOLD,GRDNEW
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| 71 | CALL MNWARN('D','MNHES1','Too many iterations on D1.'//CBF1)
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| 72 | 60 CONTINUE
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| 73 | DGRD(I) = MAX(DGMIN,ABS(GRDOLD-GRDNEW))
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| 74 | 100 CONTINUE
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| 75 | C end of first deriv. loop
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| 76 | CALL MNINEX(X)
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| 77 | RETURN
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| 78 | END
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